摘要
实验研究了试件强度与抵抗线对无底柱分段崩落法扇形炮孔爆破效果的影响,分析了有效爆破区域出现在孔底部位而不是孔口部位的原因,揭示了扇形炮孔爆破的方向性与顺势破坏效应,据此讨论了炮孔密集系数的合理取值范围以及孔底起爆的适用条件等;应用试验结果改进北氵名河铁矿扇形中深炮孔的装药结构与起爆顺序,试验区大块率从3·0%降低到1·8%·并杜绝了爆破“隔墙”现象的发生·
Experiments were conducted to investigate the effects of material strength and hole bumlen on the blast performance of fan-patterned holes in sublevel caving, and to analyze the factors affecting the effective area of blasting, Two important revelations were made in this study. （1） blasts with fan drilling exhibit a strong directionality, and （2） better fragmentation occurs in the hole-bottom region of the fan-patterned holes, where the hole spacing is larger, than in the collar region, where the spacing is smaller, The second phenomenon can be explained by the “squential effect of breakage”, that is, between-hole breakage occurs first in the collar region where the spacing between holes is small, Based on the experiment results and conclusions drawn, the effective range of hole density coefficient and the application condition of hole-hottom detonation are diseussed. The experimental results were applied to improve the load structure of eharges and the sequence of detonation in Beiminghe iron mine. The percentage of oversized lumps of the blasted ore in the mine was lowered to 1.8% from 3.0% and the occurrence of “partition wall” was successfully eliminated.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第11期1267-1270,共4页
Journal of Northeastern University(Natural Science)
基金
辽宁省自然科学基金资助项目(20021008)
辽宁省青年学科带头人基金资助项目(12402007).
关键词
无底柱分段崩落法
扇形炮孔
爆破的方向性
顺势破坏效应
sublevel caving
fan-patterned holes
directionality of blast
sequential effect of breakage
